Ceiling diffusing lighting fixture



Fb- 9, 1932. K. RjcRUMPToN 1,844,639

CEILVING D'IFFUSING LIGHTING FIXTURE Filed Oct. 8,. 1930 INVENToR."

A TTORNEY Patented Feb. 9, 1932 f` 1- uurrlzn STATES PATENT oFFIcE iKENNETH R. oRUnIIToN,` `E PITTSBURGH, PENNSYLVANIA, AssIeNoR-To`EAUEMANN- f DEPARTMENT sToREs, INC., or PITTSBURGH,rENNsYLvANIA, ACORPORATION or NEW YORK CEILING `nIrEusINa LIGHTING FIXTURE Applicationfiled october s, 193e.` serial No. lianes?.`

This invention refers to improvements in means for illumination,particularly of the interior of buildings such as stores, of the kindgenerally known as a ceiling diffuser.

Y The object in view is to interpose between a source of light, as asingle lamp, or a cluster thereof, of a li ht diffusing bowl or lens,mounted below tie light source within a surrounding-framing or easing,and adapted for vertical adjustment, with relation to the general levelof the ceiling.

. The light diffusing bowl, which is of glass or other suitabletransparent or translucent material, may be of any suitable designeither circular, rectangular, or hexagonal in plan, and with anysuitable covering bottom adapted for ornamental embodiment orincorporation with the ceiling, either clear, frosted or otherwisetreated for transmis* sion of light rays constructed and adapted tooperate in the manner more fully hereinafter described. i

In the drawings illustrating one preferred embodiment of the invention:

Fig. 1 is a vertical sectional view through the construction showing themounting of the diii'user;

Fig. 2 is an enlarged sectional detail view illustrating the adjustablemounting of the limiting rim for the upper edge of the bowl;

Fig. 3 is a detail view of the same construction on the line III III ofFig.` 2;

Fig. 4 is a cross section on the line IV--IV ol' Fig. 3, lookingupwardly. i

In the drawings, 2 is a sheet metal coping or casing extending upwardlyabove and around the main cavity 3, within which are mounted the lampsproviding the desired source off' light. Casing 2 as shown is iittedwithin the beams 4 of the ceiling construction extending thereabove intruncated cone or other desired form and terminating in an upper coping5, providing a support for the central suspension rod 6. The latter, asshown, extends upwardly through a central hole in the lower transversewall of the bowl A, and is connected at its upper end by its threadedterminal 7 within `a. supporting nut 8, at the lower end of a clustersocle mounting 9 for lamps B. Y

` Socket mounting 9 depends from al iXture 10 supported from the top ofcopmghfas shown. l

The bowl A as shown isfof a depth as to its e.

surrounding wall a sufficiently long to allow for a4 considerable rangeof vertical adjustinent, by means of the supporting rod 6," and thelimiting stops or `flanges `1 1, mounted within: la surrounding cavityat variable distances above the lowerpla-ne of the ceiling.

For providing such limitation at varying eoV heights, either with thebowl lowered mate` rially below the ceiling suriace, or raised upwardlyAsubstantially `flush therewith, as in Fig. 2, for direct downward`transmission oi light rays, the inwardly extending flanges 11 areadjustably mounted within and against the inner casing 1Q, which formsan extension of theflower wall of the main casing 2.

For such purpose flange 11 is bent inwardly I" at right angles to averticalextension 13 of the flange having an elongated slot 14, for

adjustment with relation to a securing screw 15.` 1 l The. lat-ter, asshown, extends through a washer 16 so that, the bowl havingbeen'removed, the several screws holding the correspending limitingdevices may be` slightly loosened so as to adjustthem vertically to athe bottom, the flanges 11 will be lowered accordingly `so that when thebowl A is replaced and `supported by the central rod i6, it will belocatedi'n suchrelation, as inFig. 1.

` On the other hand, with the flanges ele-V vated, the bowl `maybesecured `upwardly with its bottom surface substantially `level with the`ceiling surface, `as inFig. 2, or at any intermediate position. i

The vertical `sliding member 13 of each flange. 11 isguided between.oppositeinwardly bent lips-171 whichiembracefthe opposite p to maintainit in proper operative position.

The finishing plates 13 are preferably extended downwardly and laterallywith an ornamental border or flange 18 surrounding the dome opening andassisting in the ornamental effect.

The diameter of the bowl A is somewhat less than the receivingsurrounding space for its insertion, leaving a continuous interveningsurrounding space 19, for air circulation either inwardly or outwardly,and tending to prevent accumulation of dust or other foreign matter,while also facilitating a rapid application or removal of the fixture.

In addition to the advantages noted, the bowl itself may be readilyremoved for cleaning or renewal, and the entire construction iscomparatively simple, easy of installation and highly efficient incarrying out its intended purposes.

What I claim is:

Y 1. In a lighting fixture, the combination with a ceiling constructionhaving an inwardly extending frame surrounding a cavity provided with anupwardly extending interior casing secured tothe frame and having asource of light mounted therein, of a lower light diffusing bowlextending upwardly into the cavity, means for securing it in position,and means movably mounted on the frame within and below the casinghaving an arresting abutment limiting upward adjustment of the bowl.

2. In a lighting fixture, the combination with a ceiling constructionhaving an inwardly extending frame surrounding a cavity provided with anupwardly extending interior casing secured to the frame and having asource of light mounted therein, of a lower translucent light diffusingbowl eX- tending upwardly into the cavity, means movably mounted on theframe within and below the casing having` an arresting abutment limitingthe vertical location yof the bowl, and means supporting the bowl at thecenter.

3. In combination with the inner wall of a lamp cavity extendingupwardlybeyond a ceiling surface, a bowl limiting bracket having avertically slotted screw opening and an upper inwardly extendingterminal bowlengaging flange, a securing screw extending through theslot into the cavity wall, and a translucent light diffusing bowl havinga surrounding wall extending upwardly into the vcavity and engaging saidflange.

4. In combination with the inner wall of a lamp cavity extendingupwardly beyond a cavity walls, and a translucent light diffusing bowlhaving a surrounding wall extending upwardly into the cavity andengaging said flange.

In testimony whereof I hereunto affix my signature.

KENNETH R. CRUMPTON.

